2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License, version 2 only, as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 51
16 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 #include <urcu/list.h>
23 #include <urcu/uatomic.h>
25 #include <common/defaults.h>
26 #include <common/common.h>
27 #include <common/sessiond-comm/sessiond-comm.h>
28 #include <common/relayd/relayd.h>
29 #include <common/utils.h>
30 #include <common/compat/string.h>
35 #include "health-sessiond.h"
37 #include "kernel-consumer.h"
38 #include "lttng-sessiond.h"
46 * Used to keep a unique index for each relayd socket created where this value
47 * is associated with streams on the consumer so it can match the right relayd
48 * to send to. It must be accessed with the relayd_net_seq_idx_lock
51 static pthread_mutex_t relayd_net_seq_idx_lock
= PTHREAD_MUTEX_INITIALIZER
;
52 static uint64_t relayd_net_seq_idx
;
54 static int validate_event_name(const char *);
55 static int validate_ust_event_name(const char *);
56 static int cmd_enable_event_internal(struct ltt_session
*session
,
57 struct lttng_domain
*domain
,
58 char *channel_name
, struct lttng_event
*event
,
59 char *filter_expression
,
60 struct lttng_filter_bytecode
*filter
,
61 struct lttng_event_exclusion
*exclusion
,
65 * Create a session path used by list_lttng_sessions for the case that the
66 * session consumer is on the network.
68 static int build_network_session_path(char *dst
, size_t size
,
69 struct ltt_session
*session
)
71 int ret
, kdata_port
, udata_port
;
72 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
73 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
78 memset(tmp_urls
, 0, sizeof(tmp_urls
));
79 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
81 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
83 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
84 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
85 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
88 if (session
->ust_session
&& session
->ust_session
->consumer
) {
89 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
90 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
93 if (uuri
== NULL
&& kuri
== NULL
) {
94 uri
= &session
->consumer
->dst
.net
.control
;
95 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
96 } else if (kuri
&& uuri
) {
97 ret
= uri_compare(kuri
, uuri
);
101 /* Build uuri URL string */
102 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
109 } else if (kuri
&& uuri
== NULL
) {
111 } else if (uuri
&& kuri
== NULL
) {
115 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
121 * Do we have a UST url set. If yes, this means we have both kernel and UST
124 if (*tmp_uurl
!= '\0') {
125 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
126 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
129 if (kuri
|| (!kuri
&& !uuri
)) {
132 /* No kernel URI, use the UST port. */
135 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, dport
);
143 * Get run-time attributes if the session has been started (discarded events,
146 static int get_kernel_runtime_stats(struct ltt_session
*session
,
147 struct ltt_kernel_channel
*kchan
, uint64_t *discarded_events
,
148 uint64_t *lost_packets
)
152 if (!session
->has_been_started
) {
154 *discarded_events
= 0;
159 ret
= consumer_get_discarded_events(session
->id
, kchan
->fd
,
160 session
->kernel_session
->consumer
,
166 ret
= consumer_get_lost_packets(session
->id
, kchan
->fd
,
167 session
->kernel_session
->consumer
,
178 * Get run-time attributes if the session has been started (discarded events,
181 static int get_ust_runtime_stats(struct ltt_session
*session
,
182 struct ltt_ust_channel
*uchan
, uint64_t *discarded_events
,
183 uint64_t *lost_packets
)
186 struct ltt_ust_session
*usess
;
188 usess
= session
->ust_session
;
190 if (!usess
|| !session
->has_been_started
) {
191 *discarded_events
= 0;
197 if (usess
->buffer_type
== LTTNG_BUFFER_PER_UID
) {
198 ret
= ust_app_uid_get_channel_runtime_stats(usess
->id
,
199 &usess
->buffer_reg_uid_list
,
200 usess
->consumer
, uchan
->id
,
201 uchan
->attr
.overwrite
,
204 } else if (usess
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
205 ret
= ust_app_pid_get_channel_runtime_stats(usess
,
206 uchan
, usess
->consumer
,
207 uchan
->attr
.overwrite
,
213 *discarded_events
+= uchan
->per_pid_closed_app_discarded
;
214 *lost_packets
+= uchan
->per_pid_closed_app_lost
;
216 ERR("Unsupported buffer type");
226 * Fill lttng_channel array of all channels.
228 static void list_lttng_channels(enum lttng_domain_type domain
,
229 struct ltt_session
*session
, struct lttng_channel
*channels
,
230 struct lttcomm_channel_extended
*chan_exts
)
233 struct ltt_kernel_channel
*kchan
;
235 DBG("Listing channels for session %s", session
->name
);
238 case LTTNG_DOMAIN_KERNEL
:
239 /* Kernel channels */
240 if (session
->kernel_session
!= NULL
) {
241 cds_list_for_each_entry(kchan
,
242 &session
->kernel_session
->channel_list
.head
, list
) {
243 uint64_t discarded_events
, lost_packets
;
245 ret
= get_kernel_runtime_stats(session
, kchan
,
246 &discarded_events
, &lost_packets
);
250 /* Copy lttng_channel struct to array */
251 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
252 channels
[i
].enabled
= kchan
->enabled
;
253 chan_exts
[i
].discarded_events
=
255 chan_exts
[i
].lost_packets
= lost_packets
;
260 case LTTNG_DOMAIN_UST
:
262 struct lttng_ht_iter iter
;
263 struct ltt_ust_channel
*uchan
;
266 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
267 &iter
.iter
, uchan
, node
.node
) {
268 uint64_t discarded_events
, lost_packets
;
270 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
271 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
272 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
273 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
274 channels
[i
].attr
.switch_timer_interval
=
275 uchan
->attr
.switch_timer_interval
;
276 channels
[i
].attr
.read_timer_interval
=
277 uchan
->attr
.read_timer_interval
;
278 channels
[i
].enabled
= uchan
->enabled
;
279 channels
[i
].attr
.tracefile_size
= uchan
->tracefile_size
;
280 channels
[i
].attr
.tracefile_count
= uchan
->tracefile_count
;
283 * Map enum lttng_ust_output to enum lttng_event_output.
285 switch (uchan
->attr
.output
) {
287 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
291 * LTTNG_UST_MMAP is the only supported UST
298 ret
= get_ust_runtime_stats(session
, uchan
,
299 &discarded_events
, &lost_packets
);
303 chan_exts
[i
].discarded_events
= discarded_events
;
304 chan_exts
[i
].lost_packets
= lost_packets
;
318 static void increment_extended_len(const char *filter_expression
,
319 struct lttng_event_exclusion
*exclusion
, size_t *extended_len
)
321 *extended_len
+= sizeof(struct lttcomm_event_extended_header
);
323 if (filter_expression
) {
324 *extended_len
+= strlen(filter_expression
) + 1;
328 *extended_len
+= exclusion
->count
* LTTNG_SYMBOL_NAME_LEN
;
332 static void append_extended_info(const char *filter_expression
,
333 struct lttng_event_exclusion
*exclusion
, void **extended_at
)
335 struct lttcomm_event_extended_header extended_header
;
336 size_t filter_len
= 0;
337 size_t nb_exclusions
= 0;
339 if (filter_expression
) {
340 filter_len
= strlen(filter_expression
) + 1;
344 nb_exclusions
= exclusion
->count
;
347 /* Set header fields */
348 extended_header
.filter_len
= filter_len
;
349 extended_header
.nb_exclusions
= nb_exclusions
;
352 memcpy(*extended_at
, &extended_header
, sizeof(extended_header
));
353 *extended_at
+= sizeof(extended_header
);
355 /* Copy filter string */
356 if (filter_expression
) {
357 memcpy(*extended_at
, filter_expression
, filter_len
);
358 *extended_at
+= filter_len
;
361 /* Copy exclusion names */
363 size_t len
= nb_exclusions
* LTTNG_SYMBOL_NAME_LEN
;
365 memcpy(*extended_at
, &exclusion
->names
, len
);
371 * Create a list of agent domain events.
373 * Return number of events in list on success or else a negative value.
375 static int list_lttng_agent_events(struct agent
*agt
,
376 struct lttng_event
**events
, size_t *total_size
)
379 unsigned int nb_event
= 0;
380 struct agent_event
*event
;
381 struct lttng_event
*tmp_events
;
382 struct lttng_ht_iter iter
;
383 size_t extended_len
= 0;
389 DBG3("Listing agent events");
392 nb_event
= lttng_ht_get_count(agt
->events
);
400 /* Compute required extended infos size */
401 extended_len
= nb_event
* sizeof(struct lttcomm_event_extended_header
);
404 * This is only valid because the commands which add events are
405 * processed in the same thread as the listing.
408 cds_lfht_for_each_entry(agt
->events
->ht
, &iter
.iter
, event
, node
.node
) {
409 increment_extended_len(event
->filter_expression
, NULL
,
414 *total_size
= nb_event
* sizeof(*tmp_events
) + extended_len
;
415 tmp_events
= zmalloc(*total_size
);
417 PERROR("zmalloc agent events session");
418 ret
= -LTTNG_ERR_FATAL
;
422 extended_at
= ((uint8_t *) tmp_events
) +
423 nb_event
* sizeof(struct lttng_event
);
426 cds_lfht_for_each_entry(agt
->events
->ht
, &iter
.iter
, event
, node
.node
) {
427 strncpy(tmp_events
[i
].name
, event
->name
, sizeof(tmp_events
[i
].name
));
428 tmp_events
[i
].name
[sizeof(tmp_events
[i
].name
) - 1] = '\0';
429 tmp_events
[i
].enabled
= event
->enabled
;
430 tmp_events
[i
].loglevel
= event
->loglevel_value
;
431 tmp_events
[i
].loglevel_type
= event
->loglevel_type
;
434 /* Append extended info */
435 append_extended_info(event
->filter_expression
, NULL
,
440 *events
= tmp_events
;
444 assert(nb_event
== i
);
449 * Create a list of ust global domain events.
451 static int list_lttng_ust_global_events(char *channel_name
,
452 struct ltt_ust_domain_global
*ust_global
,
453 struct lttng_event
**events
, size_t *total_size
)
456 unsigned int nb_event
= 0;
457 struct lttng_ht_iter iter
;
458 struct lttng_ht_node_str
*node
;
459 struct ltt_ust_channel
*uchan
;
460 struct ltt_ust_event
*uevent
;
461 struct lttng_event
*tmp
;
462 size_t extended_len
= 0;
465 DBG("Listing UST global events for channel %s", channel_name
);
469 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
470 node
= lttng_ht_iter_get_node_str(&iter
);
472 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
476 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
478 nb_event
= lttng_ht_get_count(uchan
->events
);
485 DBG3("Listing UST global %d events", nb_event
);
487 /* Compute required extended infos size */
488 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
489 if (uevent
->internal
) {
494 increment_extended_len(uevent
->filter_expression
,
495 uevent
->exclusion
, &extended_len
);
498 /* All events are internal, skip. */
504 *total_size
= nb_event
* sizeof(struct lttng_event
) + extended_len
;
505 tmp
= zmalloc(*total_size
);
507 ret
= -LTTNG_ERR_FATAL
;
511 extended_at
= ((uint8_t *) tmp
) + nb_event
* sizeof(struct lttng_event
);
513 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
514 if (uevent
->internal
) {
515 /* This event should remain hidden from clients */
518 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
519 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
520 tmp
[i
].enabled
= uevent
->enabled
;
522 switch (uevent
->attr
.instrumentation
) {
523 case LTTNG_UST_TRACEPOINT
:
524 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
526 case LTTNG_UST_PROBE
:
527 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
529 case LTTNG_UST_FUNCTION
:
530 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
534 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
535 switch (uevent
->attr
.loglevel_type
) {
536 case LTTNG_UST_LOGLEVEL_ALL
:
537 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
539 case LTTNG_UST_LOGLEVEL_RANGE
:
540 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
542 case LTTNG_UST_LOGLEVEL_SINGLE
:
543 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
546 if (uevent
->filter
) {
549 if (uevent
->exclusion
) {
550 tmp
[i
].exclusion
= 1;
554 /* Append extended info */
555 append_extended_info(uevent
->filter_expression
,
556 uevent
->exclusion
, &extended_at
);
567 * Fill lttng_event array of all kernel events in the channel.
569 static int list_lttng_kernel_events(char *channel_name
,
570 struct ltt_kernel_session
*kernel_session
,
571 struct lttng_event
**events
, size_t *total_size
)
574 unsigned int nb_event
;
575 struct ltt_kernel_event
*event
;
576 struct ltt_kernel_channel
*kchan
;
577 size_t extended_len
= 0;
580 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
582 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
586 nb_event
= kchan
->event_count
;
588 DBG("Listing events for channel %s", kchan
->channel
->name
);
596 /* Compute required extended infos size */
597 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
598 increment_extended_len(event
->filter_expression
, NULL
,
602 *total_size
= nb_event
* sizeof(struct lttng_event
) + extended_len
;
603 *events
= zmalloc(*total_size
);
604 if (*events
== NULL
) {
605 ret
= LTTNG_ERR_FATAL
;
609 extended_at
= ((void *) *events
) +
610 nb_event
* sizeof(struct lttng_event
);
612 /* Kernel channels */
613 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
614 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
615 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
616 (*events
)[i
].enabled
= event
->enabled
;
617 (*events
)[i
].filter
=
618 (unsigned char) !!event
->filter_expression
;
620 switch (event
->event
->instrumentation
) {
621 case LTTNG_KERNEL_TRACEPOINT
:
622 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
624 case LTTNG_KERNEL_KRETPROBE
:
625 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
626 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
627 sizeof(struct lttng_kernel_kprobe
));
629 case LTTNG_KERNEL_KPROBE
:
630 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
631 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
632 sizeof(struct lttng_kernel_kprobe
));
634 case LTTNG_KERNEL_FUNCTION
:
635 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
636 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
637 sizeof(struct lttng_kernel_function
));
639 case LTTNG_KERNEL_NOOP
:
640 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
642 case LTTNG_KERNEL_SYSCALL
:
643 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
645 case LTTNG_KERNEL_ALL
:
651 /* Append extended info */
652 append_extended_info(event
->filter_expression
, NULL
,
660 /* Negate the error code to differentiate the size from an error */
665 * Add URI so the consumer output object. Set the correct path depending on the
666 * domain adding the default trace directory.
668 static int add_uri_to_consumer(struct consumer_output
*consumer
,
669 struct lttng_uri
*uri
, enum lttng_domain_type domain
,
670 const char *session_name
)
673 const char *default_trace_dir
;
677 if (consumer
== NULL
) {
678 DBG("No consumer detected. Don't add URI. Stopping.");
679 ret
= LTTNG_ERR_NO_CONSUMER
;
684 case LTTNG_DOMAIN_KERNEL
:
685 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
687 case LTTNG_DOMAIN_UST
:
688 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
692 * This case is possible is we try to add the URI to the global tracing
693 * session consumer object which in this case there is no subdir.
695 default_trace_dir
= "";
698 switch (uri
->dtype
) {
701 DBG2("Setting network URI to consumer");
703 if (consumer
->type
== CONSUMER_DST_NET
) {
704 if ((uri
->stype
== LTTNG_STREAM_CONTROL
&&
705 consumer
->dst
.net
.control_isset
) ||
706 (uri
->stype
== LTTNG_STREAM_DATA
&&
707 consumer
->dst
.net
.data_isset
)) {
708 ret
= LTTNG_ERR_URL_EXIST
;
712 memset(&consumer
->dst
.net
, 0, sizeof(consumer
->dst
.net
));
715 consumer
->type
= CONSUMER_DST_NET
;
717 /* Set URI into consumer output object */
718 ret
= consumer_set_network_uri(consumer
, uri
);
722 } else if (ret
== 1) {
724 * URI was the same in the consumer so we do not append the subdir
725 * again so to not duplicate output dir.
731 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
732 ret
= consumer_set_subdir(consumer
, session_name
);
734 ret
= LTTNG_ERR_FATAL
;
739 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
740 /* On a new subdir, reappend the default trace dir. */
741 strncat(consumer
->subdir
, default_trace_dir
,
742 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
743 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
748 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
749 memset(consumer
->dst
.trace_path
, 0,
750 sizeof(consumer
->dst
.trace_path
));
751 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
752 sizeof(consumer
->dst
.trace_path
));
753 /* Append default trace dir */
754 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
755 sizeof(consumer
->dst
.trace_path
) -
756 strlen(consumer
->dst
.trace_path
) - 1);
757 /* Flag consumer as local. */
758 consumer
->type
= CONSUMER_DST_LOCAL
;
769 * Init tracing by creating trace directory and sending fds kernel consumer.
771 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
774 struct lttng_ht_iter iter
;
775 struct consumer_socket
*socket
;
781 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
782 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
784 pthread_mutex_lock(socket
->lock
);
785 ret
= kernel_consumer_send_session(socket
, session
);
786 pthread_mutex_unlock(socket
->lock
);
788 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
800 * Create a socket to the relayd using the URI.
802 * On success, the relayd_sock pointer is set to the created socket.
803 * Else, it's stays untouched and a lttcomm error code is returned.
805 static int create_connect_relayd(struct lttng_uri
*uri
,
806 struct lttcomm_relayd_sock
**relayd_sock
)
809 struct lttcomm_relayd_sock
*rsock
;
811 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
812 RELAYD_VERSION_COMM_MINOR
);
814 ret
= LTTNG_ERR_FATAL
;
819 * Connect to relayd so we can proceed with a session creation. This call
820 * can possibly block for an arbitrary amount of time to set the health
821 * state to be in poll execution.
824 ret
= relayd_connect(rsock
);
827 ERR("Unable to reach lttng-relayd");
828 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
832 /* Create socket for control stream. */
833 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
834 DBG3("Creating relayd stream socket from URI");
836 /* Check relayd version */
837 ret
= relayd_version_check(rsock
);
839 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
842 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
843 DBG3("Creating relayd data socket from URI");
845 /* Command is not valid */
846 ERR("Relayd invalid stream type: %d", uri
->stype
);
847 ret
= LTTNG_ERR_INVALID
;
851 *relayd_sock
= rsock
;
856 /* The returned value is not useful since we are on an error path. */
857 (void) relayd_close(rsock
);
865 * Connect to the relayd using URI and send the socket to the right consumer.
867 static int send_consumer_relayd_socket(enum lttng_domain_type domain
,
868 unsigned int session_id
, struct lttng_uri
*relayd_uri
,
869 struct consumer_output
*consumer
,
870 struct consumer_socket
*consumer_sock
,
871 char *session_name
, char *hostname
, int session_live_timer
)
874 struct lttcomm_relayd_sock
*rsock
= NULL
;
876 /* Connect to relayd and make version check if uri is the control. */
877 ret
= create_connect_relayd(relayd_uri
, &rsock
);
878 if (ret
!= LTTNG_OK
) {
883 /* Set the network sequence index if not set. */
884 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
885 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
887 * Increment net_seq_idx because we are about to transfer the
888 * new relayd socket to the consumer.
889 * Assign unique key so the consumer can match streams.
891 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
892 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
895 /* Send relayd socket to consumer. */
896 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
897 relayd_uri
->stype
, session_id
,
898 session_name
, hostname
, session_live_timer
);
900 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
904 /* Flag that the corresponding socket was sent. */
905 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
906 consumer_sock
->control_sock_sent
= 1;
907 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
908 consumer_sock
->data_sock_sent
= 1;
914 * Close socket which was dup on the consumer side. The session daemon does
915 * NOT keep track of the relayd socket(s) once transfer to the consumer.
919 (void) relayd_close(rsock
);
923 if (ret
!= LTTNG_OK
) {
925 * The consumer output for this session should not be used anymore
926 * since the relayd connection failed thus making any tracing or/and
927 * streaming not usable.
929 consumer
->enabled
= 0;
935 * Send both relayd sockets to a specific consumer and domain. This is a
936 * helper function to facilitate sending the information to the consumer for a
939 static int send_consumer_relayd_sockets(enum lttng_domain_type domain
,
940 unsigned int session_id
, struct consumer_output
*consumer
,
941 struct consumer_socket
*sock
, char *session_name
,
942 char *hostname
, int session_live_timer
)
949 /* Sending control relayd socket. */
950 if (!sock
->control_sock_sent
) {
951 ret
= send_consumer_relayd_socket(domain
, session_id
,
952 &consumer
->dst
.net
.control
, consumer
, sock
,
953 session_name
, hostname
, session_live_timer
);
954 if (ret
!= LTTNG_OK
) {
959 /* Sending data relayd socket. */
960 if (!sock
->data_sock_sent
) {
961 ret
= send_consumer_relayd_socket(domain
, session_id
,
962 &consumer
->dst
.net
.data
, consumer
, sock
,
963 session_name
, hostname
, session_live_timer
);
964 if (ret
!= LTTNG_OK
) {
974 * Setup relayd connections for a tracing session. First creates the socket to
975 * the relayd and send them to the right domain consumer. Consumer type MUST be
978 int cmd_setup_relayd(struct ltt_session
*session
)
981 struct ltt_ust_session
*usess
;
982 struct ltt_kernel_session
*ksess
;
983 struct consumer_socket
*socket
;
984 struct lttng_ht_iter iter
;
988 usess
= session
->ust_session
;
989 ksess
= session
->kernel_session
;
991 DBG("Setting relayd for session %s", session
->name
);
995 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
996 && usess
->consumer
->enabled
) {
997 /* For each consumer socket, send relayd sockets */
998 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
1000 pthread_mutex_lock(socket
->lock
);
1001 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
->id
,
1002 usess
->consumer
, socket
,
1003 session
->name
, session
->hostname
,
1004 session
->live_timer
);
1005 pthread_mutex_unlock(socket
->lock
);
1006 if (ret
!= LTTNG_OK
) {
1009 /* Session is now ready for network streaming. */
1010 session
->net_handle
= 1;
1014 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
1015 && ksess
->consumer
->enabled
) {
1016 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
1017 socket
, node
.node
) {
1018 pthread_mutex_lock(socket
->lock
);
1019 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
->id
,
1020 ksess
->consumer
, socket
,
1021 session
->name
, session
->hostname
,
1022 session
->live_timer
);
1023 pthread_mutex_unlock(socket
->lock
);
1024 if (ret
!= LTTNG_OK
) {
1027 /* Session is now ready for network streaming. */
1028 session
->net_handle
= 1;
1038 * Start a kernel session by opening all necessary streams.
1040 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
1043 struct ltt_kernel_channel
*kchan
;
1045 /* Open kernel metadata */
1046 if (ksess
->metadata
== NULL
&& ksess
->output_traces
) {
1047 ret
= kernel_open_metadata(ksess
);
1049 ret
= LTTNG_ERR_KERN_META_FAIL
;
1054 /* Open kernel metadata stream */
1055 if (ksess
->metadata
&& ksess
->metadata_stream_fd
< 0) {
1056 ret
= kernel_open_metadata_stream(ksess
);
1058 ERR("Kernel create metadata stream failed");
1059 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1064 /* For each channel */
1065 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
1066 if (kchan
->stream_count
== 0) {
1067 ret
= kernel_open_channel_stream(kchan
);
1069 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1072 /* Update the stream global counter */
1073 ksess
->stream_count_global
+= ret
;
1077 /* Setup kernel consumer socket and send fds to it */
1078 ret
= init_kernel_tracing(ksess
);
1080 ret
= LTTNG_ERR_KERN_START_FAIL
;
1084 /* This start the kernel tracing */
1085 ret
= kernel_start_session(ksess
);
1087 ret
= LTTNG_ERR_KERN_START_FAIL
;
1091 /* Quiescent wait after starting trace */
1092 kernel_wait_quiescent(kernel_tracer_fd
);
1103 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1105 int cmd_disable_channel(struct ltt_session
*session
,
1106 enum lttng_domain_type domain
, char *channel_name
)
1109 struct ltt_ust_session
*usess
;
1111 usess
= session
->ust_session
;
1116 case LTTNG_DOMAIN_KERNEL
:
1118 ret
= channel_kernel_disable(session
->kernel_session
,
1120 if (ret
!= LTTNG_OK
) {
1124 kernel_wait_quiescent(kernel_tracer_fd
);
1127 case LTTNG_DOMAIN_UST
:
1129 struct ltt_ust_channel
*uchan
;
1130 struct lttng_ht
*chan_ht
;
1132 chan_ht
= usess
->domain_global
.channels
;
1134 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
1135 if (uchan
== NULL
) {
1136 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1140 ret
= channel_ust_disable(usess
, uchan
);
1141 if (ret
!= LTTNG_OK
) {
1147 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1159 * Command LTTNG_TRACK_PID processed by the client thread.
1161 * Called with session lock held.
1163 int cmd_track_pid(struct ltt_session
*session
, enum lttng_domain_type domain
,
1171 case LTTNG_DOMAIN_KERNEL
:
1173 struct ltt_kernel_session
*ksess
;
1175 ksess
= session
->kernel_session
;
1177 ret
= kernel_track_pid(ksess
, pid
);
1178 if (ret
!= LTTNG_OK
) {
1182 kernel_wait_quiescent(kernel_tracer_fd
);
1185 case LTTNG_DOMAIN_UST
:
1187 struct ltt_ust_session
*usess
;
1189 usess
= session
->ust_session
;
1191 ret
= trace_ust_track_pid(usess
, pid
);
1192 if (ret
!= LTTNG_OK
) {
1198 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1210 * Command LTTNG_UNTRACK_PID processed by the client thread.
1212 * Called with session lock held.
1214 int cmd_untrack_pid(struct ltt_session
*session
, enum lttng_domain_type domain
,
1222 case LTTNG_DOMAIN_KERNEL
:
1224 struct ltt_kernel_session
*ksess
;
1226 ksess
= session
->kernel_session
;
1228 ret
= kernel_untrack_pid(ksess
, pid
);
1229 if (ret
!= LTTNG_OK
) {
1233 kernel_wait_quiescent(kernel_tracer_fd
);
1236 case LTTNG_DOMAIN_UST
:
1238 struct ltt_ust_session
*usess
;
1240 usess
= session
->ust_session
;
1242 ret
= trace_ust_untrack_pid(usess
, pid
);
1243 if (ret
!= LTTNG_OK
) {
1249 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1261 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1263 * The wpipe arguments is used as a notifier for the kernel thread.
1265 int cmd_enable_channel(struct ltt_session
*session
,
1266 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
1269 struct ltt_ust_session
*usess
= session
->ust_session
;
1270 struct lttng_ht
*chan_ht
;
1277 len
= lttng_strnlen(attr
->name
, sizeof(attr
->name
));
1279 /* Validate channel name */
1280 if (attr
->name
[0] == '.' ||
1281 memchr(attr
->name
, '/', len
) != NULL
) {
1282 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1286 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
1291 * Don't try to enable a channel if the session has been started at
1292 * some point in time before. The tracer does not allow it.
1294 if (session
->has_been_started
) {
1295 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1300 * If the session is a live session, remove the switch timer, the
1301 * live timer does the same thing but sends also synchronisation
1302 * beacons for inactive streams.
1304 if (session
->live_timer
> 0) {
1305 attr
->attr
.live_timer_interval
= session
->live_timer
;
1306 attr
->attr
.switch_timer_interval
= 0;
1310 * The ringbuffer (both in user space and kernel) behave badly in overwrite
1311 * mode and with less than 2 subbuf so block it right away and send back an
1312 * invalid attribute error.
1314 if (attr
->attr
.overwrite
&& attr
->attr
.num_subbuf
< 2) {
1315 ret
= LTTNG_ERR_INVALID
;
1319 switch (domain
->type
) {
1320 case LTTNG_DOMAIN_KERNEL
:
1322 struct ltt_kernel_channel
*kchan
;
1324 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
1325 session
->kernel_session
);
1326 if (kchan
== NULL
) {
1327 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
1328 if (attr
->name
[0] != '\0') {
1329 session
->kernel_session
->has_non_default_channel
= 1;
1332 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
1335 if (ret
!= LTTNG_OK
) {
1339 kernel_wait_quiescent(kernel_tracer_fd
);
1342 case LTTNG_DOMAIN_UST
:
1343 case LTTNG_DOMAIN_JUL
:
1344 case LTTNG_DOMAIN_LOG4J
:
1345 case LTTNG_DOMAIN_PYTHON
:
1347 struct ltt_ust_channel
*uchan
;
1352 * Current agent implementation limitations force us to allow
1353 * only one channel at once in "agent" subdomains. Each
1354 * subdomain has a default channel name which must be strictly
1357 if (domain
->type
== LTTNG_DOMAIN_JUL
) {
1358 if (strncmp(attr
->name
, DEFAULT_JUL_CHANNEL_NAME
,
1359 LTTNG_SYMBOL_NAME_LEN
)) {
1360 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1363 } else if (domain
->type
== LTTNG_DOMAIN_LOG4J
) {
1364 if (strncmp(attr
->name
, DEFAULT_LOG4J_CHANNEL_NAME
,
1365 LTTNG_SYMBOL_NAME_LEN
)) {
1366 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1369 } else if (domain
->type
== LTTNG_DOMAIN_PYTHON
) {
1370 if (strncmp(attr
->name
, DEFAULT_PYTHON_CHANNEL_NAME
,
1371 LTTNG_SYMBOL_NAME_LEN
)) {
1372 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1377 chan_ht
= usess
->domain_global
.channels
;
1379 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
1380 if (uchan
== NULL
) {
1381 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
1382 if (attr
->name
[0] != '\0') {
1383 usess
->has_non_default_channel
= 1;
1386 ret
= channel_ust_enable(usess
, uchan
);
1391 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1402 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1404 int cmd_disable_event(struct ltt_session
*session
,
1405 enum lttng_domain_type domain
, char *channel_name
,
1406 struct lttng_event
*event
)
1411 DBG("Disable event command for event \'%s\'", event
->name
);
1413 event_name
= event
->name
;
1414 if (validate_event_name(event_name
)) {
1415 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1419 /* Error out on unhandled search criteria */
1420 if (event
->loglevel_type
|| event
->loglevel
!= -1 || event
->enabled
1421 || event
->pid
|| event
->filter
|| event
->exclusion
) {
1422 ret
= LTTNG_ERR_UNK
;
1429 case LTTNG_DOMAIN_KERNEL
:
1431 struct ltt_kernel_channel
*kchan
;
1432 struct ltt_kernel_session
*ksess
;
1434 ksess
= session
->kernel_session
;
1437 * If a non-default channel has been created in the
1438 * session, explicitely require that -c chan_name needs
1441 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1442 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1446 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1447 if (kchan
== NULL
) {
1448 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1452 switch (event
->type
) {
1453 case LTTNG_EVENT_ALL
:
1454 case LTTNG_EVENT_TRACEPOINT
:
1455 case LTTNG_EVENT_SYSCALL
:
1456 case LTTNG_EVENT_PROBE
:
1457 case LTTNG_EVENT_FUNCTION
:
1458 case LTTNG_EVENT_FUNCTION_ENTRY
:/* fall-through */
1459 if (event_name
[0] == '\0') {
1460 ret
= event_kernel_disable_event(kchan
,
1463 ret
= event_kernel_disable_event(kchan
,
1464 event_name
, event
->type
);
1466 if (ret
!= LTTNG_OK
) {
1471 ret
= LTTNG_ERR_UNK
;
1475 kernel_wait_quiescent(kernel_tracer_fd
);
1478 case LTTNG_DOMAIN_UST
:
1480 struct ltt_ust_channel
*uchan
;
1481 struct ltt_ust_session
*usess
;
1483 usess
= session
->ust_session
;
1485 if (validate_ust_event_name(event_name
)) {
1486 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1491 * If a non-default channel has been created in the
1492 * session, explicitly require that -c chan_name needs
1495 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1496 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1500 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1502 if (uchan
== NULL
) {
1503 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1507 switch (event
->type
) {
1508 case LTTNG_EVENT_ALL
:
1510 * An empty event name means that everything
1511 * should be disabled.
1513 if (event
->name
[0] == '\0') {
1514 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1516 ret
= event_ust_disable_tracepoint(usess
, uchan
,
1519 if (ret
!= LTTNG_OK
) {
1524 ret
= LTTNG_ERR_UNK
;
1528 DBG3("Disable UST event %s in channel %s completed", event_name
,
1532 case LTTNG_DOMAIN_LOG4J
:
1533 case LTTNG_DOMAIN_JUL
:
1534 case LTTNG_DOMAIN_PYTHON
:
1537 struct ltt_ust_session
*usess
= session
->ust_session
;
1541 switch (event
->type
) {
1542 case LTTNG_EVENT_ALL
:
1545 ret
= LTTNG_ERR_UNK
;
1549 agt
= trace_ust_find_agent(usess
, domain
);
1551 ret
= -LTTNG_ERR_UST_EVENT_NOT_FOUND
;
1555 * An empty event name means that everything
1556 * should be disabled.
1558 if (event
->name
[0] == '\0') {
1559 ret
= event_agent_disable_all(usess
, agt
);
1561 ret
= event_agent_disable(usess
, agt
, event_name
);
1563 if (ret
!= LTTNG_OK
) {
1570 ret
= LTTNG_ERR_UND
;
1583 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1585 int cmd_add_context(struct ltt_session
*session
, enum lttng_domain_type domain
,
1586 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1588 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1589 char *app_ctx_provider_name
= NULL
, *app_ctx_name
= NULL
;
1591 if (ctx
->ctx
== LTTNG_EVENT_CONTEXT_APP_CONTEXT
) {
1592 app_ctx_provider_name
= ctx
->u
.app_ctx
.provider_name
;
1593 app_ctx_name
= ctx
->u
.app_ctx
.ctx_name
;
1597 case LTTNG_DOMAIN_KERNEL
:
1598 assert(session
->kernel_session
);
1600 if (session
->kernel_session
->channel_count
== 0) {
1601 /* Create default channel */
1602 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1603 if (ret
!= LTTNG_OK
) {
1606 chan_kern_created
= 1;
1608 /* Add kernel context to kernel tracer */
1609 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1610 if (ret
!= LTTNG_OK
) {
1614 case LTTNG_DOMAIN_JUL
:
1615 case LTTNG_DOMAIN_LOG4J
:
1618 * Validate channel name.
1619 * If no channel name is given and the domain is JUL or LOG4J,
1620 * set it to the appropriate domain-specific channel name. If
1621 * a name is provided but does not match the expexted channel
1622 * name, return an error.
1624 if (domain
== LTTNG_DOMAIN_JUL
&& *channel_name
&&
1625 strcmp(channel_name
,
1626 DEFAULT_JUL_CHANNEL_NAME
)) {
1627 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1629 } else if (domain
== LTTNG_DOMAIN_LOG4J
&& *channel_name
&&
1630 strcmp(channel_name
,
1631 DEFAULT_LOG4J_CHANNEL_NAME
)) {
1632 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1635 /* break is _not_ missing here. */
1637 case LTTNG_DOMAIN_UST
:
1639 struct ltt_ust_session
*usess
= session
->ust_session
;
1640 unsigned int chan_count
;
1644 chan_count
= lttng_ht_get_count(usess
->domain_global
.channels
);
1645 if (chan_count
== 0) {
1646 struct lttng_channel
*attr
;
1647 /* Create default channel */
1648 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1650 ret
= LTTNG_ERR_FATAL
;
1654 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1655 if (ret
!= LTTNG_OK
) {
1660 chan_ust_created
= 1;
1663 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1664 free(app_ctx_provider_name
);
1666 app_ctx_name
= NULL
;
1667 app_ctx_provider_name
= NULL
;
1668 if (ret
!= LTTNG_OK
) {
1674 ret
= LTTNG_ERR_UND
;
1682 if (chan_kern_created
) {
1683 struct ltt_kernel_channel
*kchan
=
1684 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
1685 session
->kernel_session
);
1686 /* Created previously, this should NOT fail. */
1688 kernel_destroy_channel(kchan
);
1691 if (chan_ust_created
) {
1692 struct ltt_ust_channel
*uchan
=
1693 trace_ust_find_channel_by_name(
1694 session
->ust_session
->domain_global
.channels
,
1695 DEFAULT_CHANNEL_NAME
);
1696 /* Created previously, this should NOT fail. */
1698 /* Remove from the channel list of the session. */
1699 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
1701 trace_ust_destroy_channel(uchan
);
1704 free(app_ctx_provider_name
);
1709 static int validate_event_name(const char *name
)
1712 const char *c
= name
;
1713 const char *event_name_end
= c
+ LTTNG_SYMBOL_NAME_LEN
;
1714 bool null_terminated
= false;
1717 * Make sure that unescaped wildcards are only used as the last
1718 * character of the event name.
1720 while (c
< event_name_end
) {
1723 null_terminated
= true;
1729 if ((c
+ 1) < event_name_end
&& *(c
+ 1)) {
1730 /* Wildcard is not the last character */
1731 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1740 if (!ret
&& !null_terminated
) {
1741 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1746 static inline bool name_starts_with(const char *name
, const char *prefix
)
1748 const size_t max_cmp_len
= min(strlen(prefix
), LTTNG_SYMBOL_NAME_LEN
);
1750 return !strncmp(name
, prefix
, max_cmp_len
);
1753 /* Perform userspace-specific event name validation */
1754 static int validate_ust_event_name(const char *name
)
1764 * Check name against all internal UST event component namespaces used
1767 if (name_starts_with(name
, DEFAULT_JUL_EVENT_COMPONENT
) ||
1768 name_starts_with(name
, DEFAULT_LOG4J_EVENT_COMPONENT
) ||
1769 name_starts_with(name
, DEFAULT_PYTHON_EVENT_COMPONENT
)) {
1778 * Internal version of cmd_enable_event() with a supplemental
1779 * "internal_event" flag which is used to enable internal events which should
1780 * be hidden from clients. Such events are used in the agent implementation to
1781 * enable the events through which all "agent" events are funeled.
1783 static int _cmd_enable_event(struct ltt_session
*session
,
1784 struct lttng_domain
*domain
,
1785 char *channel_name
, struct lttng_event
*event
,
1786 char *filter_expression
,
1787 struct lttng_filter_bytecode
*filter
,
1788 struct lttng_event_exclusion
*exclusion
,
1789 int wpipe
, bool internal_event
)
1791 int ret
, channel_created
= 0;
1792 struct lttng_channel
*attr
;
1796 assert(channel_name
);
1798 /* If we have a filter, we must have its filter expression */
1799 assert(!(!!filter_expression
^ !!filter
));
1801 DBG("Enable event command for event \'%s\'", event
->name
);
1805 ret
= validate_event_name(event
->name
);
1810 switch (domain
->type
) {
1811 case LTTNG_DOMAIN_KERNEL
:
1813 struct ltt_kernel_channel
*kchan
;
1816 * If a non-default channel has been created in the
1817 * session, explicitely require that -c chan_name needs
1820 if (session
->kernel_session
->has_non_default_channel
1821 && channel_name
[0] == '\0') {
1822 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1826 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1827 session
->kernel_session
);
1828 if (kchan
== NULL
) {
1829 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1830 LTTNG_BUFFER_GLOBAL
);
1832 ret
= LTTNG_ERR_FATAL
;
1835 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1837 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1838 if (ret
!= LTTNG_OK
) {
1844 channel_created
= 1;
1847 /* Get the newly created kernel channel pointer */
1848 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1849 session
->kernel_session
);
1850 if (kchan
== NULL
) {
1851 /* This sould not happen... */
1852 ret
= LTTNG_ERR_FATAL
;
1856 switch (event
->type
) {
1857 case LTTNG_EVENT_ALL
:
1859 char *filter_expression_a
= NULL
;
1860 struct lttng_filter_bytecode
*filter_a
= NULL
;
1863 * We need to duplicate filter_expression and filter,
1864 * because ownership is passed to first enable
1867 if (filter_expression
) {
1868 filter_expression_a
= strdup(filter_expression
);
1869 if (!filter_expression_a
) {
1870 ret
= LTTNG_ERR_FATAL
;
1875 filter_a
= zmalloc(sizeof(*filter_a
) + filter
->len
);
1877 free(filter_expression_a
);
1878 ret
= LTTNG_ERR_FATAL
;
1881 memcpy(filter_a
, filter
, sizeof(*filter_a
) + filter
->len
);
1883 event
->type
= LTTNG_EVENT_TRACEPOINT
; /* Hack */
1884 ret
= event_kernel_enable_event(kchan
, event
,
1885 filter_expression
, filter
);
1886 /* We have passed ownership */
1887 filter_expression
= NULL
;
1889 if (ret
!= LTTNG_OK
) {
1890 if (channel_created
) {
1891 /* Let's not leak a useless channel. */
1892 kernel_destroy_channel(kchan
);
1894 free(filter_expression_a
);
1898 event
->type
= LTTNG_EVENT_SYSCALL
; /* Hack */
1899 ret
= event_kernel_enable_event(kchan
, event
,
1900 filter_expression_a
, filter_a
);
1901 /* We have passed ownership */
1902 filter_expression_a
= NULL
;
1904 if (ret
!= LTTNG_OK
) {
1909 case LTTNG_EVENT_PROBE
:
1910 case LTTNG_EVENT_FUNCTION
:
1911 case LTTNG_EVENT_FUNCTION_ENTRY
:
1912 case LTTNG_EVENT_TRACEPOINT
:
1913 ret
= event_kernel_enable_event(kchan
, event
,
1914 filter_expression
, filter
);
1915 /* We have passed ownership */
1916 filter_expression
= NULL
;
1918 if (ret
!= LTTNG_OK
) {
1919 if (channel_created
) {
1920 /* Let's not leak a useless channel. */
1921 kernel_destroy_channel(kchan
);
1926 case LTTNG_EVENT_SYSCALL
:
1927 ret
= event_kernel_enable_event(kchan
, event
,
1928 filter_expression
, filter
);
1929 /* We have passed ownership */
1930 filter_expression
= NULL
;
1932 if (ret
!= LTTNG_OK
) {
1937 ret
= LTTNG_ERR_UNK
;
1941 kernel_wait_quiescent(kernel_tracer_fd
);
1944 case LTTNG_DOMAIN_UST
:
1946 struct ltt_ust_channel
*uchan
;
1947 struct ltt_ust_session
*usess
= session
->ust_session
;
1952 * If a non-default channel has been created in the
1953 * session, explicitely require that -c chan_name needs
1956 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1957 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1961 /* Get channel from global UST domain */
1962 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1964 if (uchan
== NULL
) {
1965 /* Create default channel */
1966 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1967 usess
->buffer_type
);
1969 ret
= LTTNG_ERR_FATAL
;
1972 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1974 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1975 if (ret
!= LTTNG_OK
) {
1981 /* Get the newly created channel reference back */
1982 uchan
= trace_ust_find_channel_by_name(
1983 usess
->domain_global
.channels
, channel_name
);
1987 if (uchan
->domain
!= LTTNG_DOMAIN_UST
&& !internal_event
) {
1989 * Don't allow users to add UST events to channels which
1990 * are assigned to a userspace subdomain (JUL, Log4J,
1993 ret
= LTTNG_ERR_INVALID_CHANNEL_DOMAIN
;
1997 if (!internal_event
) {
1999 * Ensure the event name is not reserved for internal
2002 ret
= validate_ust_event_name(event
->name
);
2004 WARN("Userspace event name %s failed validation.",
2006 event
->name
: "NULL");
2007 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
2012 /* At this point, the session and channel exist on the tracer */
2013 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
,
2014 filter_expression
, filter
, exclusion
,
2016 /* We have passed ownership */
2017 filter_expression
= NULL
;
2020 if (ret
== LTTNG_ERR_UST_EVENT_ENABLED
) {
2021 goto already_enabled
;
2022 } else if (ret
!= LTTNG_OK
) {
2027 case LTTNG_DOMAIN_LOG4J
:
2028 case LTTNG_DOMAIN_JUL
:
2029 case LTTNG_DOMAIN_PYTHON
:
2031 const char *default_event_name
, *default_chan_name
;
2033 struct lttng_event uevent
;
2034 struct lttng_domain tmp_dom
;
2035 struct ltt_ust_session
*usess
= session
->ust_session
;
2039 agt
= trace_ust_find_agent(usess
, domain
->type
);
2041 agt
= agent_create(domain
->type
);
2043 ret
= LTTNG_ERR_NOMEM
;
2046 agent_add(agt
, usess
->agents
);
2049 /* Create the default tracepoint. */
2050 memset(&uevent
, 0, sizeof(uevent
));
2051 uevent
.type
= LTTNG_EVENT_TRACEPOINT
;
2052 uevent
.loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
2053 default_event_name
= event_get_default_agent_ust_name(
2055 if (!default_event_name
) {
2056 ret
= LTTNG_ERR_FATAL
;
2059 strncpy(uevent
.name
, default_event_name
, sizeof(uevent
.name
));
2060 uevent
.name
[sizeof(uevent
.name
) - 1] = '\0';
2063 * The domain type is changed because we are about to enable the
2064 * default channel and event for the JUL domain that are hardcoded.
2065 * This happens in the UST domain.
2067 memcpy(&tmp_dom
, domain
, sizeof(tmp_dom
));
2068 tmp_dom
.type
= LTTNG_DOMAIN_UST
;
2070 switch (domain
->type
) {
2071 case LTTNG_DOMAIN_LOG4J
:
2072 default_chan_name
= DEFAULT_LOG4J_CHANNEL_NAME
;
2074 case LTTNG_DOMAIN_JUL
:
2075 default_chan_name
= DEFAULT_JUL_CHANNEL_NAME
;
2077 case LTTNG_DOMAIN_PYTHON
:
2078 default_chan_name
= DEFAULT_PYTHON_CHANNEL_NAME
;
2081 /* The switch/case we are in makes this impossible */
2086 char *filter_expression_copy
= NULL
;
2087 struct lttng_filter_bytecode
*filter_copy
= NULL
;
2090 const size_t filter_size
= sizeof(
2091 struct lttng_filter_bytecode
)
2094 filter_copy
= zmalloc(filter_size
);
2096 ret
= LTTNG_ERR_NOMEM
;
2099 memcpy(filter_copy
, filter
, filter_size
);
2101 filter_expression_copy
=
2102 strdup(filter_expression
);
2103 if (!filter_expression
) {
2104 ret
= LTTNG_ERR_NOMEM
;
2107 if (!filter_expression_copy
|| !filter_copy
) {
2108 free(filter_expression_copy
);
2114 ret
= cmd_enable_event_internal(session
, &tmp_dom
,
2115 (char *) default_chan_name
,
2116 &uevent
, filter_expression_copy
,
2117 filter_copy
, NULL
, wpipe
);
2120 if (ret
== LTTNG_ERR_UST_EVENT_ENABLED
) {
2121 goto already_enabled
;
2122 } else if (ret
!= LTTNG_OK
) {
2126 /* The wild card * means that everything should be enabled. */
2127 if (strncmp(event
->name
, "*", 1) == 0 && strlen(event
->name
) == 1) {
2128 ret
= event_agent_enable_all(usess
, agt
, event
, filter
,
2131 ret
= event_agent_enable(usess
, agt
, event
, filter
,
2135 filter_expression
= NULL
;
2136 if (ret
!= LTTNG_OK
) {
2143 ret
= LTTNG_ERR_UND
;
2151 free(filter_expression
);
2159 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2160 * We own filter, exclusion, and filter_expression.
2162 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
2163 char *channel_name
, struct lttng_event
*event
,
2164 char *filter_expression
,
2165 struct lttng_filter_bytecode
*filter
,
2166 struct lttng_event_exclusion
*exclusion
,
2169 return _cmd_enable_event(session
, domain
, channel_name
, event
,
2170 filter_expression
, filter
, exclusion
, wpipe
, false);
2174 * Enable an event which is internal to LTTng. An internal should
2175 * never be made visible to clients and are immune to checks such as
2178 static int cmd_enable_event_internal(struct ltt_session
*session
,
2179 struct lttng_domain
*domain
,
2180 char *channel_name
, struct lttng_event
*event
,
2181 char *filter_expression
,
2182 struct lttng_filter_bytecode
*filter
,
2183 struct lttng_event_exclusion
*exclusion
,
2186 return _cmd_enable_event(session
, domain
, channel_name
, event
,
2187 filter_expression
, filter
, exclusion
, wpipe
, true);
2191 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2193 ssize_t
cmd_list_tracepoints(enum lttng_domain_type domain
,
2194 struct lttng_event
**events
)
2197 ssize_t nb_events
= 0;
2200 case LTTNG_DOMAIN_KERNEL
:
2201 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2202 if (nb_events
< 0) {
2203 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
2207 case LTTNG_DOMAIN_UST
:
2208 nb_events
= ust_app_list_events(events
);
2209 if (nb_events
< 0) {
2210 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2214 case LTTNG_DOMAIN_LOG4J
:
2215 case LTTNG_DOMAIN_JUL
:
2216 case LTTNG_DOMAIN_PYTHON
:
2217 nb_events
= agent_list_events(events
, domain
);
2218 if (nb_events
< 0) {
2219 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2224 ret
= LTTNG_ERR_UND
;
2231 /* Return negative value to differentiate return code */
2236 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2238 ssize_t
cmd_list_tracepoint_fields(enum lttng_domain_type domain
,
2239 struct lttng_event_field
**fields
)
2242 ssize_t nb_fields
= 0;
2245 case LTTNG_DOMAIN_UST
:
2246 nb_fields
= ust_app_list_event_fields(fields
);
2247 if (nb_fields
< 0) {
2248 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2252 case LTTNG_DOMAIN_KERNEL
:
2253 default: /* fall-through */
2254 ret
= LTTNG_ERR_UND
;
2261 /* Return negative value to differentiate return code */
2265 ssize_t
cmd_list_syscalls(struct lttng_event
**events
)
2267 return syscall_table_list(events
);
2271 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
2273 * Called with session lock held.
2275 ssize_t
cmd_list_tracker_pids(struct ltt_session
*session
,
2276 enum lttng_domain_type domain
, int32_t **pids
)
2279 ssize_t nr_pids
= 0;
2282 case LTTNG_DOMAIN_KERNEL
:
2284 struct ltt_kernel_session
*ksess
;
2286 ksess
= session
->kernel_session
;
2287 nr_pids
= kernel_list_tracker_pids(ksess
, pids
);
2289 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
2294 case LTTNG_DOMAIN_UST
:
2296 struct ltt_ust_session
*usess
;
2298 usess
= session
->ust_session
;
2299 nr_pids
= trace_ust_list_tracker_pids(usess
, pids
);
2301 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2306 case LTTNG_DOMAIN_LOG4J
:
2307 case LTTNG_DOMAIN_JUL
:
2308 case LTTNG_DOMAIN_PYTHON
:
2310 ret
= LTTNG_ERR_UND
;
2317 /* Return negative value to differentiate return code */
2322 * Command LTTNG_START_TRACE processed by the client thread.
2324 * Called with session mutex held.
2326 int cmd_start_trace(struct ltt_session
*session
)
2329 unsigned long nb_chan
= 0;
2330 struct ltt_kernel_session
*ksession
;
2331 struct ltt_ust_session
*usess
;
2335 /* Ease our life a bit ;) */
2336 ksession
= session
->kernel_session
;
2337 usess
= session
->ust_session
;
2339 /* Is the session already started? */
2340 if (session
->active
) {
2341 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2346 * Starting a session without channel is useless since after that it's not
2347 * possible to enable channel thus inform the client.
2349 if (usess
&& usess
->domain_global
.channels
) {
2350 nb_chan
+= lttng_ht_get_count(usess
->domain_global
.channels
);
2353 nb_chan
+= ksession
->channel_count
;
2356 ret
= LTTNG_ERR_NO_CHANNEL
;
2360 /* Kernel tracing */
2361 if (ksession
!= NULL
) {
2362 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
2363 if (ret
!= LTTNG_OK
) {
2368 /* Flag session that trace should start automatically */
2371 * Even though the start trace might fail, flag this session active so
2372 * other application coming in are started by default.
2376 ret
= ust_app_start_trace_all(usess
);
2378 ret
= LTTNG_ERR_UST_START_FAIL
;
2383 /* Flag this after a successful start. */
2384 session
->has_been_started
= 1;
2385 session
->active
= 1;
2394 * Command LTTNG_STOP_TRACE processed by the client thread.
2396 int cmd_stop_trace(struct ltt_session
*session
)
2399 struct ltt_kernel_channel
*kchan
;
2400 struct ltt_kernel_session
*ksession
;
2401 struct ltt_ust_session
*usess
;
2406 ksession
= session
->kernel_session
;
2407 usess
= session
->ust_session
;
2409 /* Session is not active. Skip everythong and inform the client. */
2410 if (!session
->active
) {
2411 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
2416 if (ksession
&& ksession
->active
) {
2417 DBG("Stop kernel tracing");
2419 /* Flush metadata if exist */
2420 if (ksession
->metadata_stream_fd
>= 0) {
2421 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2423 ERR("Kernel metadata flush failed");
2427 /* Flush all buffers before stopping */
2428 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2429 ret
= kernel_flush_buffer(kchan
);
2431 ERR("Kernel flush buffer error");
2435 ret
= kernel_stop_session(ksession
);
2437 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
2441 kernel_wait_quiescent(kernel_tracer_fd
);
2443 ksession
->active
= 0;
2446 if (usess
&& usess
->active
) {
2448 * Even though the stop trace might fail, flag this session inactive so
2449 * other application coming in are not started by default.
2453 ret
= ust_app_stop_trace_all(usess
);
2455 ret
= LTTNG_ERR_UST_STOP_FAIL
;
2460 /* Flag inactive after a successful stop. */
2461 session
->active
= 0;
2469 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2471 int cmd_set_consumer_uri(struct ltt_session
*session
, size_t nb_uri
,
2472 struct lttng_uri
*uris
)
2475 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2476 struct ltt_ust_session
*usess
= session
->ust_session
;
2482 /* Can't set consumer URI if the session is active. */
2483 if (session
->active
) {
2484 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2488 /* Set the "global" consumer URIs */
2489 for (i
= 0; i
< nb_uri
; i
++) {
2490 ret
= add_uri_to_consumer(session
->consumer
,
2491 &uris
[i
], 0, session
->name
);
2492 if (ret
!= LTTNG_OK
) {
2497 /* Set UST session URIs */
2498 if (session
->ust_session
) {
2499 for (i
= 0; i
< nb_uri
; i
++) {
2500 ret
= add_uri_to_consumer(
2501 session
->ust_session
->consumer
,
2502 &uris
[i
], LTTNG_DOMAIN_UST
,
2504 if (ret
!= LTTNG_OK
) {
2510 /* Set kernel session URIs */
2511 if (session
->kernel_session
) {
2512 for (i
= 0; i
< nb_uri
; i
++) {
2513 ret
= add_uri_to_consumer(
2514 session
->kernel_session
->consumer
,
2515 &uris
[i
], LTTNG_DOMAIN_KERNEL
,
2517 if (ret
!= LTTNG_OK
) {
2524 * Make sure to set the session in output mode after we set URI since a
2525 * session can be created without URL (thus flagged in no output mode).
2527 session
->output_traces
= 1;
2529 ksess
->output_traces
= 1;
2533 usess
->output_traces
= 1;
2544 * Command LTTNG_CREATE_SESSION processed by the client thread.
2546 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
2547 size_t nb_uri
, lttng_sock_cred
*creds
, unsigned int live_timer
)
2550 struct ltt_session
*session
;
2556 * Verify if the session already exist
2558 * XXX: There is no need for the session lock list here since the caller
2559 * (process_client_msg) is holding it. We might want to change that so a
2560 * single command does not lock the entire session list.
2562 session
= session_find_by_name(name
);
2563 if (session
!= NULL
) {
2564 ret
= LTTNG_ERR_EXIST_SESS
;
2568 /* Create tracing session in the registry */
2569 ret
= session_create(name
, LTTNG_SOCK_GET_UID_CRED(creds
),
2570 LTTNG_SOCK_GET_GID_CRED(creds
));
2571 if (ret
!= LTTNG_OK
) {
2576 * Get the newly created session pointer back
2578 * XXX: There is no need for the session lock list here since the caller
2579 * (process_client_msg) is holding it. We might want to change that so a
2580 * single command does not lock the entire session list.
2582 session
= session_find_by_name(name
);
2585 session
->live_timer
= live_timer
;
2586 /* Create default consumer output for the session not yet created. */
2587 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
2588 if (session
->consumer
== NULL
) {
2589 ret
= LTTNG_ERR_FATAL
;
2590 goto consumer_error
;
2594 ret
= cmd_set_consumer_uri(session
, nb_uri
, uris
);
2595 if (ret
!= LTTNG_OK
) {
2596 goto consumer_error
;
2598 session
->output_traces
= 1;
2600 session
->output_traces
= 0;
2601 DBG2("Session %s created with no output", session
->name
);
2604 session
->consumer
->enabled
= 1;
2609 session_destroy(session
);
2616 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2618 int cmd_create_session_snapshot(char *name
, struct lttng_uri
*uris
,
2619 size_t nb_uri
, lttng_sock_cred
*creds
)
2622 struct ltt_session
*session
;
2623 struct snapshot_output
*new_output
= NULL
;
2629 * Create session in no output mode with URIs set to NULL. The uris we've
2630 * received are for a default snapshot output if one.
2632 ret
= cmd_create_session_uri(name
, NULL
, 0, creds
, 0);
2633 if (ret
!= LTTNG_OK
) {
2637 /* Get the newly created session pointer back. This should NEVER fail. */
2638 session
= session_find_by_name(name
);
2641 /* Flag session for snapshot mode. */
2642 session
->snapshot_mode
= 1;
2644 /* Skip snapshot output creation if no URI is given. */
2649 new_output
= snapshot_output_alloc();
2651 ret
= LTTNG_ERR_NOMEM
;
2652 goto error_snapshot_alloc
;
2655 ret
= snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE
, NULL
,
2656 uris
, nb_uri
, session
->consumer
, new_output
, &session
->snapshot
);
2658 if (ret
== -ENOMEM
) {
2659 ret
= LTTNG_ERR_NOMEM
;
2661 ret
= LTTNG_ERR_INVALID
;
2663 goto error_snapshot
;
2667 snapshot_add_output(&session
->snapshot
, new_output
);
2674 snapshot_output_destroy(new_output
);
2675 error_snapshot_alloc
:
2676 session_destroy(session
);
2682 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2684 * Called with session lock held.
2686 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
2689 struct ltt_ust_session
*usess
;
2690 struct ltt_kernel_session
*ksess
;
2695 usess
= session
->ust_session
;
2696 ksess
= session
->kernel_session
;
2698 /* Clean kernel session teardown */
2699 kernel_destroy_session(ksess
);
2701 /* UST session teardown */
2703 /* Close any relayd session */
2704 consumer_output_send_destroy_relayd(usess
->consumer
);
2706 /* Destroy every UST application related to this session. */
2707 ret
= ust_app_destroy_trace_all(usess
);
2709 ERR("Error in ust_app_destroy_trace_all");
2712 /* Clean up the rest. */
2713 trace_ust_destroy_session(usess
);
2717 * Must notify the kernel thread here to update it's poll set in order to
2718 * remove the channel(s)' fd just destroyed.
2720 ret
= notify_thread_pipe(wpipe
);
2722 PERROR("write kernel poll pipe");
2725 ret
= session_destroy(session
);
2731 * Command LTTNG_CALIBRATE processed by the client thread.
2733 int cmd_calibrate(enum lttng_domain_type domain
,
2734 struct lttng_calibrate
*calibrate
)
2739 case LTTNG_DOMAIN_KERNEL
:
2741 struct lttng_kernel_calibrate kcalibrate
;
2743 switch (calibrate
->type
) {
2744 case LTTNG_CALIBRATE_FUNCTION
:
2746 /* Default and only possible calibrate option. */
2747 kcalibrate
.type
= LTTNG_KERNEL_CALIBRATE_KRETPROBE
;
2751 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2753 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
2758 case LTTNG_DOMAIN_UST
:
2760 struct lttng_ust_calibrate ucalibrate
;
2762 switch (calibrate
->type
) {
2763 case LTTNG_CALIBRATE_FUNCTION
:
2765 /* Default and only possible calibrate option. */
2766 ucalibrate
.type
= LTTNG_UST_CALIBRATE_TRACEPOINT
;
2770 ret
= ust_app_calibrate_glb(&ucalibrate
);
2772 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
2778 ret
= LTTNG_ERR_UND
;
2789 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2791 int cmd_register_consumer(struct ltt_session
*session
,
2792 enum lttng_domain_type domain
, const char *sock_path
,
2793 struct consumer_data
*cdata
)
2796 struct consumer_socket
*socket
= NULL
;
2803 case LTTNG_DOMAIN_KERNEL
:
2805 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2809 /* Can't register a consumer if there is already one */
2810 if (ksess
->consumer_fds_sent
!= 0) {
2811 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2815 sock
= lttcomm_connect_unix_sock(sock_path
);
2817 ret
= LTTNG_ERR_CONNECT_FAIL
;
2820 cdata
->cmd_sock
= sock
;
2822 socket
= consumer_allocate_socket(&cdata
->cmd_sock
);
2823 if (socket
== NULL
) {
2826 PERROR("close register consumer");
2828 cdata
->cmd_sock
= -1;
2829 ret
= LTTNG_ERR_FATAL
;
2833 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
2834 if (socket
->lock
== NULL
) {
2835 PERROR("zmalloc pthread mutex");
2836 ret
= LTTNG_ERR_FATAL
;
2839 pthread_mutex_init(socket
->lock
, NULL
);
2840 socket
->registered
= 1;
2843 consumer_add_socket(socket
, ksess
->consumer
);
2846 pthread_mutex_lock(&cdata
->pid_mutex
);
2848 pthread_mutex_unlock(&cdata
->pid_mutex
);
2853 /* TODO: Userspace tracing */
2854 ret
= LTTNG_ERR_UND
;
2862 consumer_destroy_socket(socket
);
2868 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2870 ssize_t
cmd_list_domains(struct ltt_session
*session
,
2871 struct lttng_domain
**domains
)
2876 struct lttng_ht_iter iter
;
2878 if (session
->kernel_session
!= NULL
) {
2879 DBG3("Listing domains found kernel domain");
2883 if (session
->ust_session
!= NULL
) {
2884 DBG3("Listing domains found UST global domain");
2888 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
2890 if (agt
->being_used
) {
2901 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2902 if (*domains
== NULL
) {
2903 ret
= LTTNG_ERR_FATAL
;
2907 if (session
->kernel_session
!= NULL
) {
2908 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2910 /* Kernel session buffer type is always GLOBAL */
2911 (*domains
)[index
].buf_type
= LTTNG_BUFFER_GLOBAL
;
2916 if (session
->ust_session
!= NULL
) {
2917 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2918 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2922 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
2924 if (agt
->being_used
) {
2925 (*domains
)[index
].type
= agt
->domain
;
2926 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2936 /* Return negative value to differentiate return code */
2942 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2944 ssize_t
cmd_list_channels(enum lttng_domain_type domain
,
2945 struct ltt_session
*session
, struct lttng_channel
**channels
)
2947 ssize_t nb_chan
= 0, payload_size
= 0, ret
;
2950 case LTTNG_DOMAIN_KERNEL
:
2951 if (session
->kernel_session
!= NULL
) {
2952 nb_chan
= session
->kernel_session
->channel_count
;
2954 DBG3("Number of kernel channels %zd", nb_chan
);
2956 ret
= -LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
2960 case LTTNG_DOMAIN_UST
:
2961 if (session
->ust_session
!= NULL
) {
2963 nb_chan
= lttng_ht_get_count(
2964 session
->ust_session
->domain_global
.channels
);
2967 DBG3("Number of UST global channels %zd", nb_chan
);
2969 ret
= -LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2974 ret
= -LTTNG_ERR_UND
;
2979 const size_t channel_size
= sizeof(struct lttng_channel
) +
2980 sizeof(struct lttcomm_channel_extended
);
2981 struct lttcomm_channel_extended
*channel_exts
;
2983 payload_size
= nb_chan
* channel_size
;
2984 *channels
= zmalloc(payload_size
);
2985 if (*channels
== NULL
) {
2986 ret
= -LTTNG_ERR_FATAL
;
2990 channel_exts
= ((void *) *channels
) +
2991 (nb_chan
* sizeof(struct lttng_channel
));
2992 list_lttng_channels(domain
, session
, *channels
, channel_exts
);
3003 * Command LTTNG_LIST_EVENTS processed by the client thread.
3005 ssize_t
cmd_list_events(enum lttng_domain_type domain
,
3006 struct ltt_session
*session
, char *channel_name
,
3007 struct lttng_event
**events
, size_t *total_size
)
3010 ssize_t nb_event
= 0;
3013 case LTTNG_DOMAIN_KERNEL
:
3014 if (session
->kernel_session
!= NULL
) {
3015 nb_event
= list_lttng_kernel_events(channel_name
,
3016 session
->kernel_session
, events
,
3020 case LTTNG_DOMAIN_UST
:
3022 if (session
->ust_session
!= NULL
) {
3023 nb_event
= list_lttng_ust_global_events(channel_name
,
3024 &session
->ust_session
->domain_global
, events
,
3029 case LTTNG_DOMAIN_LOG4J
:
3030 case LTTNG_DOMAIN_JUL
:
3031 case LTTNG_DOMAIN_PYTHON
:
3032 if (session
->ust_session
) {
3033 struct lttng_ht_iter iter
;
3037 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
,
3038 &iter
.iter
, agt
, node
.node
) {
3039 if (agt
->domain
== domain
) {
3040 nb_event
= list_lttng_agent_events(
3050 ret
= LTTNG_ERR_UND
;
3057 /* Return negative value to differentiate return code */
3062 * Using the session list, filled a lttng_session array to send back to the
3063 * client for session listing.
3065 * The session list lock MUST be acquired before calling this function. Use
3066 * session_lock_list() and session_unlock_list().
3068 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
3073 struct ltt_session
*session
;
3074 struct ltt_session_list
*list
= session_get_list();
3076 DBG("Getting all available session for UID %d GID %d",
3079 * Iterate over session list and append data after the control struct in
3082 cds_list_for_each_entry(session
, &list
->head
, list
) {
3084 * Only list the sessions the user can control.
3086 if (!session_access_ok(session
, uid
, gid
)) {
3090 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3091 struct ltt_ust_session
*usess
= session
->ust_session
;
3093 if (session
->consumer
->type
== CONSUMER_DST_NET
||
3094 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
3095 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
3096 ret
= build_network_session_path(sessions
[i
].path
,
3097 sizeof(sessions
[i
].path
), session
);
3099 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
3100 session
->consumer
->dst
.trace_path
);
3103 PERROR("snprintf session path");
3107 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
3108 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
3109 sessions
[i
].enabled
= session
->active
;
3110 sessions
[i
].snapshot_mode
= session
->snapshot_mode
;
3111 sessions
[i
].live_timer_interval
= session
->live_timer
;
3117 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
3118 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
3120 int cmd_data_pending(struct ltt_session
*session
)
3123 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3124 struct ltt_ust_session
*usess
= session
->ust_session
;
3128 /* Session MUST be stopped to ask for data availability. */
3129 if (session
->active
) {
3130 ret
= LTTNG_ERR_SESSION_STARTED
;
3134 * If stopped, just make sure we've started before else the above call
3135 * will always send that there is data pending.
3137 * The consumer assumes that when the data pending command is received,
3138 * the trace has been started before or else no output data is written
3139 * by the streams which is a condition for data pending. So, this is
3140 * *VERY* important that we don't ask the consumer before a start
3143 if (!session
->has_been_started
) {
3149 if (ksess
&& ksess
->consumer
) {
3150 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
3152 /* Data is still being extracted for the kernel. */
3157 if (usess
&& usess
->consumer
) {
3158 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
3160 /* Data is still being extracted for the kernel. */
3165 /* Data is ready to be read by a viewer */
3173 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
3175 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3177 int cmd_snapshot_add_output(struct ltt_session
*session
,
3178 struct lttng_snapshot_output
*output
, uint32_t *id
)
3181 struct snapshot_output
*new_output
;
3186 DBG("Cmd snapshot add output for session %s", session
->name
);
3189 * Permission denied to create an output if the session is not
3190 * set in no output mode.
3192 if (session
->output_traces
) {
3193 ret
= LTTNG_ERR_EPERM
;
3197 /* Only one output is allowed until we have the "tee" feature. */
3198 if (session
->snapshot
.nb_output
== 1) {
3199 ret
= LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST
;
3203 new_output
= snapshot_output_alloc();
3205 ret
= LTTNG_ERR_NOMEM
;
3209 ret
= snapshot_output_init(output
->max_size
, output
->name
,
3210 output
->ctrl_url
, output
->data_url
, session
->consumer
, new_output
,
3211 &session
->snapshot
);
3213 if (ret
== -ENOMEM
) {
3214 ret
= LTTNG_ERR_NOMEM
;
3216 ret
= LTTNG_ERR_INVALID
;
3222 snapshot_add_output(&session
->snapshot
, new_output
);
3224 *id
= new_output
->id
;
3231 snapshot_output_destroy(new_output
);
3237 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
3239 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3241 int cmd_snapshot_del_output(struct ltt_session
*session
,
3242 struct lttng_snapshot_output
*output
)
3245 struct snapshot_output
*sout
= NULL
;
3253 * Permission denied to create an output if the session is not
3254 * set in no output mode.
3256 if (session
->output_traces
) {
3257 ret
= LTTNG_ERR_EPERM
;
3262 DBG("Cmd snapshot del output id %" PRIu32
" for session %s", output
->id
,
3264 sout
= snapshot_find_output_by_id(output
->id
, &session
->snapshot
);
3265 } else if (*output
->name
!= '\0') {
3266 DBG("Cmd snapshot del output name %s for session %s", output
->name
,
3268 sout
= snapshot_find_output_by_name(output
->name
, &session
->snapshot
);
3271 ret
= LTTNG_ERR_INVALID
;
3275 snapshot_delete_output(&session
->snapshot
, sout
);
3276 snapshot_output_destroy(sout
);
3285 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
3287 * If no output is available, outputs is untouched and 0 is returned.
3289 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
3291 ssize_t
cmd_snapshot_list_outputs(struct ltt_session
*session
,
3292 struct lttng_snapshot_output
**outputs
)
3295 struct lttng_snapshot_output
*list
= NULL
;
3296 struct lttng_ht_iter iter
;
3297 struct snapshot_output
*output
;
3302 DBG("Cmd snapshot list outputs for session %s", session
->name
);
3305 * Permission denied to create an output if the session is not
3306 * set in no output mode.
3308 if (session
->output_traces
) {
3309 ret
= -LTTNG_ERR_EPERM
;
3313 if (session
->snapshot
.nb_output
== 0) {
3318 list
= zmalloc(session
->snapshot
.nb_output
* sizeof(*list
));
3320 ret
= -LTTNG_ERR_NOMEM
;
3324 /* Copy list from session to the new list object. */
3326 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
, &iter
.iter
,
3327 output
, node
.node
) {
3328 assert(output
->consumer
);
3329 list
[idx
].id
= output
->id
;
3330 list
[idx
].max_size
= output
->max_size
;
3331 strncpy(list
[idx
].name
, output
->name
, sizeof(list
[idx
].name
));
3332 if (output
->consumer
->type
== CONSUMER_DST_LOCAL
) {
3333 strncpy(list
[idx
].ctrl_url
, output
->consumer
->dst
.trace_path
,
3334 sizeof(list
[idx
].ctrl_url
));
3337 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.control
,
3338 list
[idx
].ctrl_url
, sizeof(list
[idx
].ctrl_url
));
3340 ret
= -LTTNG_ERR_NOMEM
;
3345 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.data
,
3346 list
[idx
].data_url
, sizeof(list
[idx
].data_url
));
3348 ret
= -LTTNG_ERR_NOMEM
;
3357 ret
= session
->snapshot
.nb_output
;
3365 * Send relayd sockets from snapshot output to consumer. Ignore request if the
3366 * snapshot output is *not* set with a remote destination.
3368 * Return 0 on success or a LTTNG_ERR code.
3370 static int set_relayd_for_snapshot(struct consumer_output
*consumer
,
3371 struct snapshot_output
*snap_output
, struct ltt_session
*session
)
3374 struct lttng_ht_iter iter
;
3375 struct consumer_socket
*socket
;
3378 assert(snap_output
);
3381 DBG2("Set relayd object from snapshot output");
3383 /* Ignore if snapshot consumer output is not network. */
3384 if (snap_output
->consumer
->type
!= CONSUMER_DST_NET
) {
3389 * For each consumer socket, create and send the relayd object of the
3393 cds_lfht_for_each_entry(snap_output
->consumer
->socks
->ht
, &iter
.iter
,
3394 socket
, node
.node
) {
3395 ret
= send_consumer_relayd_sockets(0, session
->id
,
3396 snap_output
->consumer
, socket
,
3397 session
->name
, session
->hostname
,
3398 session
->live_timer
);
3399 if (ret
!= LTTNG_OK
) {
3411 * Record a kernel snapshot.
3413 * Return LTTNG_OK on success or a LTTNG_ERR code.
3415 static int record_kernel_snapshot(struct ltt_kernel_session
*ksess
,
3416 struct snapshot_output
*output
, struct ltt_session
*session
,
3417 int wait
, uint64_t nb_packets_per_stream
)
3425 /* Get the datetime for the snapshot output directory. */
3426 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
3427 sizeof(output
->datetime
));
3429 ret
= LTTNG_ERR_INVALID
;
3434 * Copy kernel session sockets so we can communicate with the right
3435 * consumer for the snapshot record command.
3437 ret
= consumer_copy_sockets(output
->consumer
, ksess
->consumer
);
3439 ret
= LTTNG_ERR_NOMEM
;
3443 ret
= set_relayd_for_snapshot(ksess
->consumer
, output
, session
);
3444 if (ret
!= LTTNG_OK
) {
3445 goto error_snapshot
;
3448 ret
= kernel_snapshot_record(ksess
, output
, wait
, nb_packets_per_stream
);
3449 if (ret
!= LTTNG_OK
) {
3450 goto error_snapshot
;
3457 /* Clean up copied sockets so this output can use some other later on. */
3458 consumer_destroy_output_sockets(output
->consumer
);
3465 * Record a UST snapshot.
3467 * Return 0 on success or a LTTNG_ERR error code.
3469 static int record_ust_snapshot(struct ltt_ust_session
*usess
,
3470 struct snapshot_output
*output
, struct ltt_session
*session
,
3471 int wait
, uint64_t nb_packets_per_stream
)
3479 /* Get the datetime for the snapshot output directory. */
3480 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
3481 sizeof(output
->datetime
));
3483 ret
= LTTNG_ERR_INVALID
;
3488 * Copy UST session sockets so we can communicate with the right
3489 * consumer for the snapshot record command.
3491 ret
= consumer_copy_sockets(output
->consumer
, usess
->consumer
);
3493 ret
= LTTNG_ERR_NOMEM
;
3497 ret
= set_relayd_for_snapshot(usess
->consumer
, output
, session
);
3498 if (ret
!= LTTNG_OK
) {
3499 goto error_snapshot
;
3502 ret
= ust_app_snapshot_record(usess
, output
, wait
, nb_packets_per_stream
);
3506 ret
= LTTNG_ERR_INVALID
;
3509 ret
= LTTNG_ERR_SNAPSHOT_NODATA
;
3512 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
3515 goto error_snapshot
;
3521 /* Clean up copied sockets so this output can use some other later on. */
3522 consumer_destroy_output_sockets(output
->consumer
);
3528 uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session
*session
,
3529 uint64_t cur_nr_packets
)
3531 uint64_t tot_size
= 0;
3533 if (session
->kernel_session
) {
3534 struct ltt_kernel_channel
*chan
;
3535 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3537 cds_list_for_each_entry(chan
, &ksess
->channel_list
.head
, list
) {
3538 if (cur_nr_packets
>= chan
->channel
->attr
.num_subbuf
) {
3540 * Don't take channel into account if we
3541 * already grab all its packets.
3545 tot_size
+= chan
->channel
->attr
.subbuf_size
3546 * chan
->stream_count
;
3550 if (session
->ust_session
) {
3551 struct ltt_ust_session
*usess
= session
->ust_session
;
3553 tot_size
+= ust_app_get_size_one_more_packet_per_stream(usess
,
3561 * Calculate the number of packets we can grab from each stream that
3562 * fits within the overall snapshot max size.
3564 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
3565 * the number of packets per stream.
3567 * TODO: this approach is not perfect: we consider the worse case
3568 * (packet filling the sub-buffers) as an upper bound, but we could do
3569 * better if we do this calculation while we actually grab the packet
3570 * content: we would know how much padding we don't actually store into
3573 * This algorithm is currently bounded by the number of packets per
3576 * Since we call this algorithm before actually grabbing the data, it's
3577 * an approximation: for instance, applications could appear/disappear
3578 * in between this call and actually grabbing data.
3581 int64_t get_session_nb_packets_per_stream(struct ltt_session
*session
, uint64_t max_size
)
3584 uint64_t cur_nb_packets
= 0;
3587 return 0; /* Infinite */
3590 size_left
= max_size
;
3592 uint64_t one_more_packet_tot_size
;
3594 one_more_packet_tot_size
= get_session_size_one_more_packet_per_stream(session
,
3596 if (!one_more_packet_tot_size
) {
3597 /* We are already grabbing all packets. */
3600 size_left
-= one_more_packet_tot_size
;
3601 if (size_left
< 0) {
3606 if (!cur_nb_packets
) {
3607 /* Not enough room to grab one packet of each stream, error. */
3610 return cur_nb_packets
;
3614 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3616 * The wait parameter is ignored so this call always wait for the snapshot to
3617 * complete before returning.
3619 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3621 int cmd_snapshot_record(struct ltt_session
*session
,
3622 struct lttng_snapshot_output
*output
, int wait
)
3625 unsigned int use_tmp_output
= 0;
3626 struct snapshot_output tmp_output
;
3627 unsigned int snapshot_success
= 0;
3632 DBG("Cmd snapshot record for session %s", session
->name
);
3635 * Permission denied to create an output if the session is not
3636 * set in no output mode.
3638 if (session
->output_traces
) {
3639 ret
= LTTNG_ERR_EPERM
;
3643 /* The session needs to be started at least once. */
3644 if (!session
->has_been_started
) {
3645 ret
= LTTNG_ERR_START_SESSION_ONCE
;
3649 /* Use temporary output for the session. */
3650 if (*output
->ctrl_url
!= '\0') {
3651 ret
= snapshot_output_init(output
->max_size
, output
->name
,
3652 output
->ctrl_url
, output
->data_url
, session
->consumer
,
3655 if (ret
== -ENOMEM
) {
3656 ret
= LTTNG_ERR_NOMEM
;
3658 ret
= LTTNG_ERR_INVALID
;
3662 /* Use the global session count for the temporary snapshot. */
3663 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3667 if (session
->kernel_session
) {
3668 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3670 if (use_tmp_output
) {
3671 int64_t nb_packets_per_stream
;
3673 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
3674 tmp_output
.max_size
);
3675 if (nb_packets_per_stream
< 0) {
3676 ret
= LTTNG_ERR_MAX_SIZE_INVALID
;
3679 ret
= record_kernel_snapshot(ksess
, &tmp_output
, session
,
3680 wait
, nb_packets_per_stream
);
3681 if (ret
!= LTTNG_OK
) {
3684 snapshot_success
= 1;
3686 struct snapshot_output
*sout
;
3687 struct lttng_ht_iter iter
;
3690 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
3691 &iter
.iter
, sout
, node
.node
) {
3692 int64_t nb_packets_per_stream
;
3695 * Make a local copy of the output and assign the possible
3696 * temporary value given by the caller.
3698 memset(&tmp_output
, 0, sizeof(tmp_output
));
3699 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
3701 if (output
->max_size
!= (uint64_t) -1ULL) {
3702 tmp_output
.max_size
= output
->max_size
;
3705 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
3706 tmp_output
.max_size
);
3707 if (nb_packets_per_stream
< 0) {
3708 ret
= LTTNG_ERR_MAX_SIZE_INVALID
;
3712 /* Use temporary name. */
3713 if (*output
->name
!= '\0') {
3714 strncpy(tmp_output
.name
, output
->name
,
3715 sizeof(tmp_output
.name
));
3718 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3720 ret
= record_kernel_snapshot(ksess
, &tmp_output
,
3721 session
, wait
, nb_packets_per_stream
);
3722 if (ret
!= LTTNG_OK
) {
3726 snapshot_success
= 1;
3732 if (session
->ust_session
) {
3733 struct ltt_ust_session
*usess
= session
->ust_session
;
3735 if (use_tmp_output
) {
3736 int64_t nb_packets_per_stream
;
3738 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
3739 tmp_output
.max_size
);
3740 if (nb_packets_per_stream
< 0) {
3741 ret
= LTTNG_ERR_MAX_SIZE_INVALID
;
3744 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
3745 wait
, nb_packets_per_stream
);
3746 if (ret
!= LTTNG_OK
) {
3749 snapshot_success
= 1;
3751 struct snapshot_output
*sout
;
3752 struct lttng_ht_iter iter
;
3755 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
3756 &iter
.iter
, sout
, node
.node
) {
3757 int64_t nb_packets_per_stream
;
3760 * Make a local copy of the output and assign the possible
3761 * temporary value given by the caller.
3763 memset(&tmp_output
, 0, sizeof(tmp_output
));
3764 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
3766 if (output
->max_size
!= (uint64_t) -1ULL) {
3767 tmp_output
.max_size
= output
->max_size
;
3770 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
3771 tmp_output
.max_size
);
3772 if (nb_packets_per_stream
< 0) {
3773 ret
= LTTNG_ERR_MAX_SIZE_INVALID
;
3778 /* Use temporary name. */
3779 if (*output
->name
!= '\0') {
3780 strncpy(tmp_output
.name
, output
->name
,
3781 sizeof(tmp_output
.name
));
3784 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3786 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
3787 wait
, nb_packets_per_stream
);
3788 if (ret
!= LTTNG_OK
) {
3792 snapshot_success
= 1;
3798 if (snapshot_success
) {
3799 session
->snapshot
.nb_snapshot
++;
3801 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
3809 * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
3811 int cmd_set_session_shm_path(struct ltt_session
*session
,
3812 const char *shm_path
)
3818 * Can only set shm path before session is started.
3820 if (session
->has_been_started
) {
3821 return LTTNG_ERR_SESSION_STARTED
;
3824 strncpy(session
->shm_path
, shm_path
,
3825 sizeof(session
->shm_path
));
3826 session
->shm_path
[sizeof(session
->shm_path
) - 1] = '\0';
3832 * Init command subsystem.
3837 * Set network sequence index to 1 for streams to match a relayd
3838 * socket on the consumer side.
3840 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
3841 relayd_net_seq_idx
= 1;
3842 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
3844 DBG("Command subsystem initialized");